html, body {
    padding:0;
    margin:0;
}
.fragment {
    position: absolute;
    top: 0;
    left: 0;
}
.page {
    background-repeat: no-repeat;
    background-size: 100% 100%;
}
.hide {
    display: none;
}
#music_button {
    position: absolute;
    right: 20px;
    top: 20px;
    z-index: 200;
    width: 30px;
    height: 30px;
    background-image: url(normalmusic.svg);
    background-size: contain;
    background-repeat: no-repeat;
}
@keyframes rotating {
    from {
        transform: rotate(0deg)
    }
    to {
        transform: rotate(360deg)
    }
}
.rotate {
    animation: rotating 1.2s linear infinite;
}
@keyframes arrow-float {
    0%, 30% {
        opacity: 0;
        transform: translate(0, 10px)
    }
    60% {
        opacity: 1;
        transform: translate(0, 0)
    }
    100% {
        opacity: 0;
        transform: translate(0, -8px)
    }
}
.arrow-wrap {
    position: absolute;
    bottom: 25px;
    left: 50%;
    z-index: 150;
    margin-left: -7px;
    animation: arrow-float 1.5s infinite ease-in-out;
}
.arrow-wrap>.arrow1 {
    transform: rotate(-135deg);
    left: 1px;
}
.arrow-wrap>.arrow2 {
    left: -4.5px;
    transform: rotate(-45deg);
}
.arrow-wrap>.arrow1, .arrow-wrap>.arrow2 {
    background-color: #fff;
    width: 14px;
    height: 5px;
    border-radius: 2px;
    position: absolute;
    top: 5px;
}
